crs1026
Superstar
I completed my admittedly amateurish but hopefully interesting look at the Havelock route curves and speeds.
The good news is, the result was far more positive than I would have predicted. My notional end to end time, not providing for time in meets, stations, contingency, etc was 3 hours 37 minutes. If one adds dwell time and some padding, one can certainly have confidence that the timing is not going to be worse than today. An overall speed of 69.5 mph is not too shabby.
My calc came in some distance above the cited 3 hours 15 minutes, however. This is not surprising because a) my assumptions were deliberately conservative and b) it's a pretty crude spreadsheet.
The big things I learned are
a) The number of curves, and the small number of seconds gained by straightening any one curve, suggest that only a few judicious tweaks to the trackage may be affordable and justifiable
b) I made only a partial effort to include what I will call "futile sprints"... that is, assuming that trains would accelerate wherever possible between curves to whatever peak speed could be attained before braking to comply with the next curve. That only seemed to glean seconds per short tangent segment, and not minutes.
c) If the sprinting is the solution, tilting trains don't help with that.
d) The assumptions around banking and curve speed may be what differentiates this calculation from the "real" story
Here is the high level of my data. Rather than debating the fine points, it might be worth just looking at the timing for individual segments and see if my times differ from others' opinions consistently across all parts of the route - which would suggest my assumptions are simply off base - or am I most off in any particular portion of the route.
- Paul
The good news is, the result was far more positive than I would have predicted. My notional end to end time, not providing for time in meets, stations, contingency, etc was 3 hours 37 minutes. If one adds dwell time and some padding, one can certainly have confidence that the timing is not going to be worse than today. An overall speed of 69.5 mph is not too shabby.
My calc came in some distance above the cited 3 hours 15 minutes, however. This is not surprising because a) my assumptions were deliberately conservative and b) it's a pretty crude spreadsheet.
The big things I learned are
a) The number of curves, and the small number of seconds gained by straightening any one curve, suggest that only a few judicious tweaks to the trackage may be affordable and justifiable
b) I made only a partial effort to include what I will call "futile sprints"... that is, assuming that trains would accelerate wherever possible between curves to whatever peak speed could be attained before braking to comply with the next curve. That only seemed to glean seconds per short tangent segment, and not minutes.
c) If the sprinting is the solution, tilting trains don't help with that.
d) The assumptions around banking and curve speed may be what differentiates this calculation from the "real" story
Here is the high level of my data. Rather than debating the fine points, it might be worth just looking at the timing for individual segments and see if my times differ from others' opinions consistently across all parts of the route - which would suggest my assumptions are simply off base - or am I most off in any particular portion of the route.
- Paul